Elevate your tuna melt game with this delicious open-faced sandwich. Creamy mozzarella and sharp white Cheddar blend perfectly with tangy capers, celery, and green onion in the tuna salad. A touch of Asian chile paste adds a secret specialty from Chef John.
In a mixing bowl, break apart the tuna with a fork and add celery, green onion, capers, mayonnaise, and chile paste. Mix in small pieces of mozzarella and season with salt and black pepper. Refrigerate the tuna salad until needed.
Line a baking sheet with aluminum foil and preheat the oven's broiler.
Spread butter on both sides of French bread slices. Broil buttered side until golden brown, 2 to 3 minutes. Flip and broil the other side until toasted, another 2 to 3 minutes. Turn slices over on the baking sheet with the darkest sides down.
Using 2 forks, spread the tuna salad onto bread slices, going all the way to the edges. Top with shredded Cheddar and a pinch of cayenne pepper.
Place sandwiches under the broiler and cook until cheese melts and bubbles, about 5 to 6 minutes.
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